Class 10 Science Biology Heredity and Evolution



In pea plants, the long-stem trait is dominant and the short-stern trait is recessive. Two pea plants were crossed, producing seeds that yielded 165 long-stem plants and 54 short-stem plants. The genotypes of the parent plants were most likely
(a)
and
(b)
and
(c)
and
(d)
and
Correct answer: (b) 
Solution: 
  • The ratio of long stem plants to short stem plants among the progeny is 165:54 which means it has a ratio of 3:1. This ratio is possible if the parents are heterozygous in nature which after the cross will produce homozygous tall, heterozygous tall and homozygous dwarf offsprings. 
  • As the heterozygous offspring expresses the dominant allele, they will also be tall. This is a classic example of the monohybrid ratio that produces a ratio of 3:1 in the F2 generation of pure line parents.

So, the correct option is 'LI and LI'.

widgit image
Connecting you to a tutor in 60 seconds.
Get answers to your doubts.
play store logo
apple store logo
Similar topics
components of food
heredity and evolution
how do organisms reproduce?
microorganisms: friend and foe
why do we fall ill?
widgit image
Connecting you to a tutor in 60 seconds.
Get answers to your doubts.
play store logo
apple store logo
components of food
heredity and evolution
how do organisms reproduce?
microorganisms: friend and foe
why do we fall ill?